Fit a heatproof bowl over a pot of simmering water, making sure the water does not touch the bottom of the bowl. Fill the bowl with your dark chocolate pieces and stir until melted, about 5 minutes. Remove the bowl and stir in most of the crystallized ginger and Kashmiri Garam Masala (saving a bit for the end).
Line a cookie tray or baking sheet with parchment paper and pour the melted chocolate onto the sheet. Using a spatula, smooth out the chocolate into an even layer about ¼ inch thick. Add the cranberries and nuts, and finish it off with a sprinkle of Garam Masala.
Chill or refrigerate for 20 to 30 minutes or until firm.